linux-ext4 - [PATCH 2/7] fat: remove ->writepage

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Message-Id: <20221202102644.770505-3-hch@lst.de>
Date:   Fri,  2 Dec 2022 11:26:39 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Jan Kara <jack@...e.com>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
        Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
        Dave Kleikamp <shaggy@...nel.org>,
        Bob Copeland <me@...copeland.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net,
        linux-karma-devel@...ts.sourceforge.net, linux-mm@...ck.org,
        Johannes Weiner <hannes@...xchg.org>
Subject: [PATCH 2/7] fat: remove ->writepage

->writepage is a very inefficient method to write back data, and only
used through write_cache_pages or a a fallback when no ->migrate_folio
method is present.

Set ->migrate_folio to the generic buffer_head based helper, and remove
the ->writepage implementation.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Johannes Weiner <hannes@...xchg.org>
---
 fs/fat/inode.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 1cbcc4608dc78f..d99b8549ec8f91 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -194,11 +194,6 @@ static int fat_get_block(struct inode *inode, sector_t iblock,
 	return 0;
 }
 
-static int fat_writepage(struct page *page, struct writeback_control *wbc)
-{
-	return block_write_full_page(page, fat_get_block, wbc);
-}
-
 static int fat_writepages(struct address_space *mapping,
 			  struct writeback_control *wbc)
 {
@@ -346,12 +341,12 @@ static const struct address_space_operations fat_aops = {
 	.invalidate_folio = block_invalidate_folio,
 	.read_folio	= fat_read_folio,
 	.readahead	= fat_readahead,
-	.writepage	= fat_writepage,
 	.writepages	= fat_writepages,
 	.write_begin	= fat_write_begin,
 	.write_end	= fat_write_end,
 	.direct_IO	= fat_direct_IO,
-	.bmap		= _fat_bmap
+	.bmap		= _fat_bmap,
+	.migrate_folio	= buffer_migrate_folio,
 };
 
 /*
-- 
2.30.2